OHAUS MB120 Service Manual page 41

CHAPTER 3 – MAINTENANCE PROCEDURES
5. Replacing the Power Board PCB by removing the below cables from
the PCB. Locate the two screws securing the PCB and remove the
screws (top right, bottom left).
6. Remove the Power Board from compartment.
7. Replacing the Power Switch PCB by removing two cables from the
PCB. Locate and remove the 4 screws at 4 corners of the PCB which
securing the PCB in the compartment.
8. Remove the Power Switch from the compartment.
Note: When there is power cycling the Power Switch PCB the green
LED will light up. If the LED does not light up possible defective PCB
or main fuse in the AC plug is open circuit and need to be replaced.
MB90 MB120 Series Service Manual
Screw
Removing cables from Power Switch PCB.
Screw
35 Ohaus Corporation www.ohaus.com
Remove cables from Power Board
PCB